From 8a5e811c7fbc3eb660e8705cab306d317a379326 Mon Sep 17 00:00:00 2001
From: James Roseborough <james.roseborough@luaj.org>
Date: Sat, 26 Jan 2013 20:04:05 +0000
Subject: [PATCH] Add test for long substring.

---
 test/junit/org/luaj/vm2/StringTest.java | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/test/junit/org/luaj/vm2/StringTest.java b/test/junit/org/luaj/vm2/StringTest.java
index 9463689b..300bec75 100644
--- a/test/junit/org/luaj/vm2/StringTest.java
+++ b/test/junit/org/luaj/vm2/StringTest.java
@@ -210,4 +210,16 @@ public class StringTest extends TestCase {
 		assertSame(sub1, sub2);
 		assertFalse(src.m_bytes == sub1.m_bytes);
 	}
+	
+	public void testShortSubstringOfVeryLongStringGetsNewBacking() {
+		LuaString src = LuaString.valueOf(
+				"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ" +
+				"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ" );
+		LuaString sub1 = src.substring(10, 50);
+		LuaString sub2 = src.substring(10, 50);
+		assertEquals(sub1.m_offset, 0);
+		assertEquals(sub1.m_length, 40);
+		assertFalse(sub1 == sub2);
+		assertFalse(src.m_bytes == sub1.m_bytes);
+	}
 }